THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Mechanical digestion involves physically breaking down food substances into smaller particles to more efficiently undergo chemical digestion. The role of chemical digestion is to further degrade the molecular structure of the ingested compounds by digestive enzymes into a form that is absorbable into the bloodstream.

Detailed explanation-2: -Mechanical digestion begins in your mouth with chewing, then moves to churning in the stomach and segmentation in the small intestine. Peristalsis is also part of mechanical digestion.

Detailed explanation-3: -Mechanical digestion is physical digestion done by teeth. Churning of food into smaller substances is an example of mechanical digestion. Breaking down food into a smaller substance is a helpful process so that food can easily undergo chemical digestion.